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Date: Thu, 8 Sep 2022 19:48:04 +0300
From: Vladimir Oltean <vladimir.oltean@....com>
To: netdev@...r.kernel.org
Cc: "David S. Miller" <davem@...emloft.net>,
Eric Dumazet <edumazet@...gle.com>,
Jakub Kicinski <kuba@...nel.org>,
Paolo Abeni <pabeni@...hat.com>,
Xiaoliang Yang <xiaoliang.yang_1@....com>,
Claudiu Manoil <claudiu.manoil@....com>,
Alexandre Belloni <alexandre.belloni@...tlin.com>,
UNGLinuxDriver@...rochip.com, Andrew Lunn <andrew@...n.ch>,
Vivien Didelot <vivien.didelot@...il.com>,
Florian Fainelli <f.fainelli@...il.com>,
Maxim Kochetkov <fido_max@...ox.ru>,
Colin Foster <colin.foster@...advantage.com>,
Richie Pearn <richard.pearn@....com>,
linux-kernel@...r.kernel.org
Subject: [PATCH net-next 02/14] net: mscc: ocelot: make access to STAT_VIEW sleepable again
To support SPI-controlled switches in the future, access to
SYS_STAT_CFG_STAT_VIEW needs to be done outside of any spinlock
protected region, but it still needs to be serialized (by a mutex).
Split the ocelot->stats_lock spinlock into a mutex that serializes
indirect access to hardware registers (ocelot->stat_view_lock) and a
spinlock that serializes access to the u64 ocelot->stats array.
Signed-off-by: Vladimir Oltean <vladimir.oltean@....com>
---
drivers/net/dsa/ocelot/felix_vsc9959.c | 4 +--
drivers/net/ethernet/mscc/ocelot.c | 48 ++++++++++++++++++++------
include/soc/mscc/ocelot.h | 9 +++--
3 files changed, 45 insertions(+), 16 deletions(-)
diff --git a/drivers/net/dsa/ocelot/felix_vsc9959.c b/drivers/net/dsa/ocelot/felix_vsc9959.c
index 10db0b69b681..18543bee793b 100644
--- a/drivers/net/dsa/ocelot/felix_vsc9959.c
+++ b/drivers/net/dsa/ocelot/felix_vsc9959.c
@@ -2519,7 +2519,7 @@ static void vsc9959_psfp_sgi_table_del(struct ocelot *ocelot,
static void vsc9959_psfp_counters_get(struct ocelot *ocelot, u32 index,
struct felix_stream_filter_counters *counters)
{
- spin_lock(&ocelot->stats_lock);
+ mutex_lock(&ocelot->stat_view_lock);
ocelot_rmw(ocelot, SYS_STAT_CFG_STAT_VIEW(index),
SYS_STAT_CFG_STAT_VIEW_M,
@@ -2538,7 +2538,7 @@ static void vsc9959_psfp_counters_get(struct ocelot *ocelot, u32 index,
SYS_STAT_CFG_STAT_CLEAR_SHOT(0x10),
SYS_STAT_CFG);
- spin_unlock(&ocelot->stats_lock);
+ mutex_unlock(&ocelot->stat_view_lock);
}
static int vsc9959_psfp_filter_add(struct ocelot *ocelot, int port,
diff --git a/drivers/net/ethernet/mscc/ocelot.c b/drivers/net/ethernet/mscc/ocelot.c
index dddaffdaad9a..a677a18239c5 100644
--- a/drivers/net/ethernet/mscc/ocelot.c
+++ b/drivers/net/ethernet/mscc/ocelot.c
@@ -1870,12 +1870,13 @@ void ocelot_get_strings(struct ocelot *ocelot, int port, u32 sset, u8 *data)
}
EXPORT_SYMBOL(ocelot_get_strings);
-/* Caller must hold &ocelot->stats_lock */
+/* Read the counters from hardware and keep them in region->buf.
+ * Caller must hold &ocelot->stat_view_lock.
+ */
static int ocelot_port_update_stats(struct ocelot *ocelot, int port)
{
- unsigned int idx = port * OCELOT_NUM_STATS;
struct ocelot_stats_region *region;
- int err, j;
+ int err;
/* Configure the port to read the stats from */
ocelot_write(ocelot, SYS_STAT_CFG_STAT_VIEW(port), SYS_STAT_CFG);
@@ -1885,7 +1886,21 @@ static int ocelot_port_update_stats(struct ocelot *ocelot, int port)
region->count);
if (err)
return err;
+ }
+
+ return 0;
+}
+/* Transfer the counters from region->buf to ocelot->stats.
+ * Caller must hold &ocelot->stat_view_lock and &ocelot->stats_lock.
+ */
+static void ocelot_port_transfer_stats(struct ocelot *ocelot, int port)
+{
+ unsigned int idx = port * OCELOT_NUM_STATS;
+ struct ocelot_stats_region *region;
+ int j;
+
+ list_for_each_entry(region, &ocelot->stats_regions, node) {
for (j = 0; j < region->count; j++) {
u64 *stat = &ocelot->stats[idx + j];
u64 val = region->buf[j];
@@ -1898,8 +1913,6 @@ static int ocelot_port_update_stats(struct ocelot *ocelot, int port)
idx += region->count;
}
-
- return err;
}
static void ocelot_check_stats_work(struct work_struct *work)
@@ -1907,15 +1920,21 @@ static void ocelot_check_stats_work(struct work_struct *work)
struct delayed_work *del_work = to_delayed_work(work);
struct ocelot *ocelot = container_of(del_work, struct ocelot,
stats_work);
- int i, err;
+ int port, err;
- spin_lock(&ocelot->stats_lock);
- for (i = 0; i < ocelot->num_phys_ports; i++) {
- err = ocelot_port_update_stats(ocelot, i);
+ mutex_lock(&ocelot->stat_view_lock);
+
+ for (port = 0; port < ocelot->num_phys_ports; port++) {
+ err = ocelot_port_update_stats(ocelot, port);
if (err)
break;
+
+ spin_lock(&ocelot->stats_lock);
+ ocelot_port_transfer_stats(ocelot, port);
+ spin_unlock(&ocelot->stats_lock);
}
- spin_unlock(&ocelot->stats_lock);
+
+ mutex_unlock(&ocelot->stat_view_lock);
if (err)
dev_err(ocelot->dev, "Error %d updating ethtool stats\n", err);
@@ -1928,11 +1947,15 @@ void ocelot_get_ethtool_stats(struct ocelot *ocelot, int port, u64 *data)
{
int i, err;
- spin_lock(&ocelot->stats_lock);
+ mutex_lock(&ocelot->stat_view_lock);
/* check and update now */
err = ocelot_port_update_stats(ocelot, port);
+ spin_lock(&ocelot->stats_lock);
+
+ ocelot_port_transfer_stats(ocelot, port);
+
/* Copy all supported counters */
for (i = 0; i < OCELOT_NUM_STATS; i++) {
int index = port * OCELOT_NUM_STATS + i;
@@ -1945,6 +1968,8 @@ void ocelot_get_ethtool_stats(struct ocelot *ocelot, int port, u64 *data)
spin_unlock(&ocelot->stats_lock);
+ mutex_unlock(&ocelot->stat_view_lock);
+
if (err)
dev_err(ocelot->dev, "Error %d updating ethtool stats\n", err);
}
@@ -3396,6 +3421,7 @@ int ocelot_init(struct ocelot *ocelot)
return -ENOMEM;
spin_lock_init(&ocelot->stats_lock);
+ mutex_init(&ocelot->stat_view_lock);
mutex_init(&ocelot->ptp_lock);
mutex_init(&ocelot->mact_lock);
mutex_init(&ocelot->fwd_domain_lock);
diff --git a/include/soc/mscc/ocelot.h b/include/soc/mscc/ocelot.h
index 99d679235070..e85fb3b15524 100644
--- a/include/soc/mscc/ocelot.h
+++ b/include/soc/mscc/ocelot.h
@@ -901,12 +901,15 @@ struct ocelot {
struct ocelot_psfp_list psfp;
- /* Workqueue to check statistics for overflow with its lock */
- spinlock_t stats_lock;
- u64 *stats;
+ /* Workqueue to check statistics for overflow */
struct delayed_work stats_work;
struct workqueue_struct *stats_queue;
+ /* Lock for serializing access to the statistics array */
+ spinlock_t stats_lock;
+ u64 *stats;
+ /* Lock for serializing indirect access to STAT_VIEW registers */
+ struct mutex stat_view_lock;
/* Lock for serializing access to the MAC table */
struct mutex mact_lock;
/* Lock for serializing forwarding domain changes */
--
2.34.1
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